Invalid chair



FIG. 1 is a side elevational view of an invalid chair showing my new and original design, the right and left side views being mirror images of each other;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an invalid chair, as shown and described. 